#include <vector>
#include <set>
#include <iostream>
#include <unordered_map>
using namespace std;

int countBattleships(vector<vector<char>>& board) {
    int row = board.size();
    int col = board[0].size();
    int ans = 0;
    for (int i = 0; i < row; ++i) {
        for (int j = 0; j < col; ++j) { 
            if (board[i][j] == 'X') {
                if (i > 0 && board[i - 1][j] == 'X') {
                    continue;
                }
                if (j > 0 && board[i][j - 1] == 'X') {
                    continue;
                }
                ans++;
            }
        }
    }
    return ans;
}

int main(){
    vector<vector<char>> img = { {'X','.','.','X'},{'.','.','.','X'},{'.','.','.','X'} };
    cout << countBattleships(img) << endl;
    return 0;
}